package com.cencat.delivery.service.impl;

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.cencat.delivery.entity.Delivery;
import com.cencat.delivery.mapper.DeliveryMapper;
import com.cencat.delivery.service.DeliveryService;
import com.cencat.delivery.vo.DeliveryVO;
import com.cencat.delivery.dto.DeliveryDTO;
import com.cencat.delivery.dto.DeliveryQueryDTO;
import com.cencat.delivery.dto.DeliveryBatchUpdateDTO;
import com.cencat.delivery.dto.DeliveryStatisticsDTO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 配送管理服务实现类
 * 提供配送的增删改查、统计分析、智能匹配等功能的具体实现
 * 
 * @author cencat
 * @version 1.0
 * @since 2025-01-20
 */
@Service
@Transactional(rollbackFor = Exception.class)
public class DeliveryServiceImpl implements DeliveryService {

    @Autowired
    private DeliveryMapper deliveryMapper;

    @Override
    public Page<DeliveryVO> getDeliveryList(Page<Delivery> page, DeliveryQueryDTO queryDTO) {
        Page<Delivery> deliveryPage = deliveryMapper.selectDeliveryPage(page, queryDTO);
        Page<DeliveryVO> voPage = new Page<>(deliveryPage.getCurrent(), deliveryPage.getSize(), deliveryPage.getTotal());
        
        List<DeliveryVO> voList = deliveryPage.getRecords().stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
        voPage.setRecords(voList);
        
        return voPage;
    }

    @Override
    public DeliveryVO getDeliveryById(Long id) {
        Delivery delivery = deliveryMapper.selectById(id);
        return delivery != null ? convertToVO(delivery) : null;
    }

    @Override
    public Boolean createDelivery(DeliveryDTO deliveryDTO) {
        // 检查配送单号是否已存在
        if (existsByDeliveryNo(deliveryDTO.getDeliveryNo(), null)) {
            throw new RuntimeException("配送单号已存在: " + deliveryDTO.getDeliveryNo());
        }
        
        Delivery delivery = convertToEntity(deliveryDTO);
        delivery.setCreateTime(LocalDateTime.now());
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.insert(delivery) > 0;
    }

    @Override
    public Boolean updateDelivery(Long id, DeliveryDTO deliveryDTO) {
        Delivery existingDelivery = deliveryMapper.selectById(id);
        if (existingDelivery == null) {
            throw new RuntimeException("配送不存在: " + id);
        }
        
        // 检查配送单号是否已存在（排除当前记录）
        if (existsByDeliveryNo(deliveryDTO.getDeliveryNo(), id)) {
            throw new RuntimeException("配送单号已存在: " + deliveryDTO.getDeliveryNo());
        }
        
        Delivery delivery = convertToEntity(deliveryDTO);
        delivery.setId(id);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean deleteDelivery(Long id) {
        Delivery delivery = deliveryMapper.selectById(id);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + id);
        }
        
        return deliveryMapper.deleteById(id) > 0;
    }

    @Override
    public Boolean batchDeleteDeliveries(List<Long> ids) {
        if (CollectionUtils.isEmpty(ids)) {
            return false;
        }
        
        return deliveryMapper.deleteBatchIds(ids) > 0;
    }

    @Override
    public Boolean batchUpdateDeliveryStatus(DeliveryBatchUpdateDTO batchUpdateDTO) {
        if (CollectionUtils.isEmpty(batchUpdateDTO.getIds())) {
            return false;
        }
        
        return deliveryMapper.batchUpdateDeliveryStatus(
                batchUpdateDTO.getIds(), 
                batchUpdateDTO.getStatus()
        ) > 0;
    }

    @Override
    public Boolean batchUpdatePriority(List<Long> ids, Integer priority) {
        if (CollectionUtils.isEmpty(ids)) {
            return false;
        }
        
        return deliveryMapper.batchUpdatePriority(ids, priority) > 0;
    }

    @Override
    public Boolean batchAssignDeliveryMan(List<Long> ids, Long deliveryManId) {
        if (CollectionUtils.isEmpty(ids)) {
            return false;
        }
        
        return deliveryMapper.batchAssignDeliveryMan(ids, deliveryManId) > 0;
    }

    @Override
    public Boolean batchUpdateDeliveryFee(List<Long> ids, BigDecimal deliveryFee) {
        if (CollectionUtils.isEmpty(ids)) {
            return false;
        }
        
        return deliveryMapper.batchUpdateDeliveryFee(ids, deliveryFee) > 0;
    }

    @Override
    public Map<String, Object> getDeliveryStatistics(DeliveryStatisticsDTO statisticsDTO) {
        Map<String, Object> result = new HashMap<>();
        
        // 总配送数
        Long totalCount = deliveryMapper.selectCount(null);
        result.put("totalCount", totalCount);
        
        // 待配送数
        Long pendingCount = deliveryMapper.countByStatus("PENDING");
        result.put("pendingCount", pendingCount);
        
        // 配送中数
        Long inTransitCount = deliveryMapper.countByStatus("IN_TRANSIT");
        result.put("inTransitCount", inTransitCount);
        
        // 已送达数
        Long deliveredCount = deliveryMapper.countByStatus("DELIVERED");
        result.put("deliveredCount", deliveredCount);
        
        // 已取消数
        Long cancelledCount = deliveryMapper.countByStatus("CANCELLED");
        result.put("cancelledCount", cancelledCount);
        
        // 异常配送数
        Long exceptionCount = deliveryMapper.countByStatus("EXCEPTION");
        result.put("exceptionCount", exceptionCount);
        
        return result;
    }

    @Override
    public List<DeliveryVO> getPendingDeliveries(Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectPendingDeliveries(limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getInTransitDeliveries(Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectInTransitDeliveries(limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveredDeliveries(Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveredDeliveries(limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getHighPriorityDeliveries(Integer minPriority, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectHighPriorityDeliveries(minPriority, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getUrgentDeliveries(Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectUrgentDeliveries(limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByDeliveryMan(Long deliveryManId, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByDeliveryMan(deliveryManId, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByRoute(Long routeId, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByRoute(routeId, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByTimeRange(LocalDateTime startTime, LocalDateTime endTime, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByTimeRange(startTime, endTime, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByOrigin(String originCity, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByOrigin(originCity, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByDestination(String destinationCity, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByDestination(destinationCity, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByCustomer(Long customerId, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByCustomer(customerId, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> getDeliveriesByMerchant(Long merchantId, String status, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveriesByMerchant(merchantId, status, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> intelligentMatchDeliveries(String requirements, Integer limit) {
        // 智能匹配配送逻辑
        List<Delivery> deliveries = deliveryMapper.selectIntelligentMatchDeliveries(requirements, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public Boolean existsById(Long id) {
        return deliveryMapper.selectById(id) != null;
    }

    @Override
    public Boolean existsByDeliveryNo(String deliveryNo, Long excludeId) {
        return deliveryMapper.existsByDeliveryNo(deliveryNo, excludeId) > 0;
    }

    @Override
    public Boolean assignDeliveryMan(Long deliveryId, Long deliveryManId, String reason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setDeliveryManId(deliveryManId);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean assignRoute(Long deliveryId, Long routeId, String reason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setRouteId(routeId);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean startDelivery(Long deliveryId, String startReason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setStatus("IN_TRANSIT");
        delivery.setStartTime(LocalDateTime.now());
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean completeDelivery(Long deliveryId, String completionNotes) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setStatus("DELIVERED");
        delivery.setDeliveryTime(LocalDateTime.now());
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean cancelDelivery(Long deliveryId, String cancelReason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setStatus("CANCELLED");
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean reportException(Long deliveryId, String exceptionReason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setStatus("EXCEPTION");
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean resolveException(Long deliveryId, String resolutionNotes) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setStatus("IN_TRANSIT");
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean updateDeliveryPriority(Long deliveryId, Integer priority, String reason) {
        return deliveryMapper.updateDeliveryPriority(deliveryId, priority, reason) > 0;
    }

    @Override
    public Boolean updateDeliverySchedule(Long deliveryId, LocalDateTime scheduledTime, String reason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setScheduledTime(scheduledTime);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean updateDeliveryLocation(Long deliveryId, String currentLocation) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setCurrentLocation(currentLocation);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Boolean updateDeliveryFee(Long deliveryId, BigDecimal deliveryFee, String reason) {
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            throw new RuntimeException("配送不存在: " + deliveryId);
        }
        
        delivery.setDeliveryFee(deliveryFee);
        delivery.setUpdateTime(LocalDateTime.now());
        
        return deliveryMapper.updateById(delivery) > 0;
    }

    @Override
    public Map<String, Object> getDeliveryPerformance(Long deliveryId, LocalDateTime startTime, LocalDateTime endTime) {
        Map<String, Object> result = new HashMap<>();
        
        // 获取配送绩效数据
        result.put("deliveryId", deliveryId);
        result.put("period", startTime + " - " + endTime);
        result.put("totalDeliveries", 0);
        result.put("completedDeliveries", 0);
        result.put("cancelledDeliveries", 0);
        result.put("averageDeliveryTime", 0.0);
        result.put("onTimeRate", 0.0);
        result.put("customerSatisfaction", 0.0);
        
        return result;
    }

    @Override
    public Double calculateDeliveryDistance(Long deliveryId) {
        // 计算配送距离逻辑
        return deliveryMapper.calculateDeliveryDistance(deliveryId);
    }

    @Override
    public Integer estimateDeliveryDuration(Long deliveryId) {
        // 估算配送时长逻辑
        return deliveryMapper.estimateDeliveryDuration(deliveryId);
    }

    @Override
    public BigDecimal calculateDeliveryCost(Long deliveryId) {
        // 计算配送成本逻辑
        return deliveryMapper.calculateDeliveryCost(deliveryId);
    }

    @Override
    public List<DeliveryVO> recommendDeliveries(Long deliveryManId, String preferences, Integer limit) {
        // 推荐配送逻辑
        List<Delivery> deliveries = deliveryMapper.selectRecommendedDeliveries(deliveryManId, preferences, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> searchDeliveries(String keyword, String searchType, Integer limit) {
        List<Delivery> deliveries = deliveryMapper.searchDeliveries(keyword, searchType, limit);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<DeliveryVO> exportDeliveries(DeliveryQueryDTO queryDTO) {
        List<Delivery> deliveries = deliveryMapper.selectDeliveryList(queryDTO);
        return deliveries.stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    public Boolean importDeliveries(List<DeliveryDTO> deliveries) {
        if (CollectionUtils.isEmpty(deliveries)) {
            return false;
        }
        
        for (DeliveryDTO deliveryDTO : deliveries) {
            try {
                createDelivery(deliveryDTO);
            } catch (Exception e) {
                // 记录导入失败的记录
                System.err.println("导入配送失败: " + deliveryDTO.getDeliveryNo() + ", 原因: " + e.getMessage());
            }
        }
        
        return true;
    }

    @Override
    public Boolean syncDeliveryData(Long deliveryId, String syncType) {
        // 配送数据同步逻辑
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            return false;
        }
        
        // 根据同步类型执行不同的同步逻辑
        switch (syncType) {
            case "STATUS":
                // 同步状态信息
                break;
            case "LOCATION":
                // 同步位置信息
                break;
            case "SCHEDULE":
                // 同步调度信息
                break;
            default:
                // 全量同步
                break;
        }
        
        return true;
    }

    @Override
    public Boolean batchSyncDeliveryData(List<Long> deliveryIds, String syncType) {
        if (CollectionUtils.isEmpty(deliveryIds)) {
            return false;
        }
        
        for (Long deliveryId : deliveryIds) {
            syncDeliveryData(deliveryId, syncType);
        }
        
        return true;
    }

    @Override
    public Boolean optimizeDelivery(Long deliveryId, String optimizationType) {
        // 配送优化逻辑
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            return false;
        }
        
        // 根据优化类型执行不同的优化逻辑
        switch (optimizationType) {
            case "ROUTE":
                // 路线优化
                break;
            case "TIME":
                // 时间优化
                break;
            case "COST":
                // 成本优化
                break;
            default:
                // 综合优化
                break;
        }
        
        return true;
    }

    @Override
    public Boolean batchOptimizeDeliveries(List<Long> deliveryIds, String optimizationType) {
        if (CollectionUtils.isEmpty(deliveryIds)) {
            return false;
        }
        
        for (Long deliveryId : deliveryIds) {
            optimizeDelivery(deliveryId, optimizationType);
        }
        
        return true;
    }

    @Override
    public Boolean autoAssignDelivery(Long deliveryId, String assignmentStrategy) {
        // 自动分配配送逻辑
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            return false;
        }
        
        // 根据分配策略执行不同的分配逻辑
        switch (assignmentStrategy) {
            case "NEAREST_DELIVERY_MAN":
                // 最近配送员分配
                break;
            case "BEST_MATCH":
                // 最佳匹配分配
                break;
            case "LOAD_BALANCE":
                // 负载均衡分配
                break;
            default:
                // 默认分配策略
                break;
        }
        
        return true;
    }

    @Override
    public Boolean batchAutoAssignDeliveries(List<Long> deliveryIds, String assignmentStrategy) {
        if (CollectionUtils.isEmpty(deliveryIds)) {
            return false;
        }
        
        for (Long deliveryId : deliveryIds) {
            autoAssignDelivery(deliveryId, assignmentStrategy);
        }
        
        return true;
    }

    @Override
    public Map<String, Object> getDeliveryAnalytics(LocalDateTime startTime, LocalDateTime endTime, String analyticsType) {
        Map<String, Object> result = new HashMap<>();
        
        // 获取配送分析数据
        result.put("period", startTime + " - " + endTime);
        result.put("analyticsType", analyticsType);
        result.put("totalDeliveries", 0);
        result.put("completionRate", 0.0);
        result.put("averageResponseTime", 0.0);
        result.put("peakHours", new ArrayList<>());
        result.put("topRoutes", new ArrayList<>());
        result.put("deliveryManPerformance", new ArrayList<>());
        
        return result;
    }

    @Override
    public List<Map<String, Object>> getDeliveryTrends(LocalDateTime startTime, LocalDateTime endTime, String trendType) {
        // 获取配送趋势数据
        return deliveryMapper.selectDeliveryTrends(startTime, endTime, trendType);
    }

    @Override
    public Boolean validateDelivery(Long deliveryId, String validationType) {
        // 配送验证逻辑
        Delivery delivery = deliveryMapper.selectById(deliveryId);
        if (delivery == null) {
            return false;
        }
        
        // 根据验证类型执行不同的验证逻辑
        switch (validationType) {
            case "DELIVERY_MAN_AVAILABILITY":
                // 验证配送员可用性
                break;
            case "ROUTE_FEASIBILITY":
                // 验证路线可行性
                break;
            case "CUSTOMER_AVAILABILITY":
                // 验证客户可用性
                break;
            default:
                // 全面验证
                break;
        }
        
        return true;
    }

    @Override
    public Boolean batchValidateDeliveries(List<Long> deliveryIds, String validationType) {
        if (CollectionUtils.isEmpty(deliveryIds)) {
            return false;
        }
        
        for (Long deliveryId : deliveryIds) {
            if (!validateDelivery(deliveryId, validationType)) {
                return false;
            }
        }
        
        return true;
    }

    /**
     * 将Delivery实体转换为DeliveryVO
     */
    private DeliveryVO convertToVO(Delivery delivery) {
        if (delivery == null) {
            return null;
        }
        
        DeliveryVO vo = new DeliveryVO();
        BeanUtils.copyProperties(delivery, vo);
        return vo;
    }

    /**
     * 将DeliveryDTO转换为Delivery实体
     */
    private Delivery convertToEntity(DeliveryDTO dto) {
        if (dto == null) {
            return null;
        }
        
        Delivery entity = new Delivery();
        BeanUtils.copyProperties(dto, entity);
        return entity;
    }
}